cannot add a domain

currently i have zimbra installed on fedora core 4. I go to the admin page to configure a new domain, but when i click finish to save it...nothing happens. apparantly it doesn't hang or anything since i can click previous and it quickly recognizes that, and i can click cancel and the same thing happens. i need a new domain and if it's a bug i wanted to point it out....if it's me being stupid, then let's keep that to ourselves